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nep•tu•ni•um



Pronunciation: (nep-tOO'nē-um, -tyOO'-), [key]
n. Chem., Physics.
a transuranic element produced in nuclear reactors by the neutron bombardment of U-238: decays rapidly to plutonium and then to U-235. Symbol: Np; at. no.: 93.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

Neptunianneral
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